11/29/09 Update
Unit 2 Canopy shot from front
End of week 6 for Units 1 & 2, first day of 7th week
End of week 3 for Unit 3, first day of 4th week
End of week 2 for Unit 4, first day of 3rd week
Today Unit 3 and the unit in the veg room had their reservoirs changed, unit 3 to aggressive bloom, mother reservoir to regular growth formula.
C99 'grapefruit' cola
This week, trichome willing and if the plants keep to the schedule recommended by the breeder, should be the last week for our first 2 units before harvest day on the 6th of December at day 50. I hope I don't have to pull them early as I've noticed that after the addition of the Ripen one week ago, they have put on considerable weight. However, they have also been through a rough patch & I'm not just referring to the KoolBloom Dry.
C99 'pineapple' with C99 x BB at the far right edge
At first I thought I was being over run by brown algae which I thought was choking/smothering the roots & eating their food which caused those pictures of damage I showed you before. I do believe that was a problem earlier on, but now as new growth is dandy & the yellowing is not continuing. Plus the PH is no longer climbing as it was when the algae was bit more of a problem - I believe the flushing out with FloraShield combined with the addition of Hygrozyme & FloraShield to the biweekly nutrient regiment either killed it off or at least kept it at bay from wreaking anymore havoc than it already had. Just to mention, "brown algae" is a misnomer - it belongs to a group of organisms previously classified as algae due to similarities in nutrient uptake, it is actually a cyanobacteria.
C99 'grapefruit'
All seemed well, plants were improving, the yellowing had stopped, when quite suddenly midweek I noticed a more severe browning/crisping of the leaves at the top of unit 2. Naturally I thought the brown algae was back again, but the steady PH readings didn't seem to bear that out, they were holding steady and if anything, dropping a tad in Unit 3 - when you're dealing with brown algae, your PH swings up. What also convinced me was it wasn't just yellowing as it had before, it was browning & crisping and all the plants below the canopy weren't effected - all green. Plus, the leaves on the plants in the unit directly to the front of Unit 2 (Unit 4) were showing the same speckled browning & crisping as well on the side closest to the HPS - more importantly they were not yellowing as the older units had. I looked at a few pictures and it was clear the damage was heat stress. But why now? The canopy was at 90 degrees at it's highest but that should be no trouble for a plant room fully supplemented with Co2 and why the sudden sensitivity? It seems there was a broken timer, mechanical error, which lead to my Co2 burner not turning on for what I can gather must have been 2 or 3 days. This appears to be what caused the sudden heat damage. C99 X BB 'bravo' as the plant most effected, but basically, the plants directly below the HPS at the highest level of the canopy had their fan leaves burned. Especially those in Unit 2 as they were closer to the lights than the plants in Unit 1. Needless to say I replaced the timer & the Co2 is running on time again.
C99 X A11 mid-level canopy
I hope the strain of it hasn't significantly damaged the plants in units 1 & 2 - the Ripen has significantly added weight to the blooms & they're drinking water like a champ. But a case of brown algae, no matter if it was contained, coupled with a spot of heat stress may have been too much for them, we shall see. I'll not cry as others have suffered far worse, a few days early harvest plus the favorable smoke reports will ease whatever sadness I will have over the lack of extra weight if an early harvest is needed.
C99 X BB 'bravo' cola - this is the very highest point of the canopy, note the severest heat stress damage
I've decided the plants will be taken early if it appears that either the plant is just dying, or the buds are being damaged. Temporarily I am of the mind that if the sweet leaves start to yellow, I'll sacrifice them for a few more days of weight if it comes down to it, just to see what kind of weight I'd have sacrificed had I saved the "sweet leaves" to be used for hash. If the plants leaves yellowing progresses to shriveling and dying en masse, I think I have no choice but to harvest in that case - I have to remember that this is an annual & that it is natural for it to die after it has pushed forth it's final reproductive effort. Plants don't harvest on a set schedule & there are any factors that contribute, got to remember that too. I do not think the plants have been damaged enough to warrant an early harvest as the two older units are drinking their water like mad. The one I'm keeping my eye on is the C99 X A11 - the phenotype is very Apollo 11 and it's got an earlier flowering time than the others by one week and it is coincidentally this plant that is looking like it may be ready very, very soon despite being the least damaged plant of unit 2. I also want to harvest in stages b/c it's an experimental grow, taking the buds just as they start to turn cloudy, a 50/50 clear-cloudy, & a 100% cloudy harvest to compare, maybe also a harvest with 10-25% amber for the C99s crossed with Blueberry (as these 2 units are sativa dominant I think their best expression is in the THC/cerebral high)
Unit 2 C99 X A11, the lower part of the canopy
Another less depressing thought is this: Units 1 & 2 suffered some heat burn, Units 1 & 2 also suffered an early but brief bout of what was likely brown algae which caused an interruption in nutrient uptake causing a deficiency, but I believe it was successfully handled and is no longer present. The yellowing & crinkling leaves I have seen before in many grows here people flush the last week or two, it's a deficit of nutrients but primarily Nitrogen. I used the Aggressive Bloom formula which, unlike regular Bloom, uses no FloraGro - the main source of Nitrogen. Given all in all, I'm inclined to think this explains the dramatic (to my newbie eyes) yellowing without a flush and the reports on the nice taste of sampled buds from the lab rats, plus the plants being annuals and are ending their life cycle naturally. Had the plants not had to deal with the microbial issue, the surrounding leaves likely would have stayed greener up to now. That's my present thought on the subject.
C99 'grapefruit' the lower part of the canopy - these buds were shielded by higher vegetation too
Another thought regarding the possible brown algae - I took a reservoir and filled it with "tainted" equipment, the reservoir would have been tainted with the algae as well - I added to it the recommended Physan 20 dilution. When Physan 20 hits microbes, it fizzes like crazy. Here it didn't. However, the much used measuring bucket which surely had some bacteria on it did react with the Physan 20 mixture & fizzed up as it killed whatever microbes were there. As I even threw in some of the brown roots, they did not fizz. Perhaps after treating the unit for so long with Hygrozyme & FloraShield the algae disappeared along with any other significant amounts of microbes.
This is C99 X A11, I'm watching this plant close as it's the one that looks close to being finished early
I think I may add here that I'm likely not going to flush this crop. Nitrogen has the biggest effect on taste and as you can tell from the leaves, it's not got much if any Nitrogen (or other minerals) left in it. I will of course flush the Hydroton after harvest.
C99 X BB 'echo' cola
I've added extra fans on the floors & mounted on the walls to increase circulation. In light of some information from Weezard & others on Canna forums about the effects of UVB I will be shutting off my UVB for the rest of the grow & just let them cloud & hit them with a bit of UVB for an hour or four to amber the desired amount of trichomes.
C99 X A11 bud arm